小程序授权支付接口方法 前端

  payup: function () {
    //获取用户的openid
    var that = this;
    var order_number = that.data.order_number;
    var fee = that.data.money;
    var appid = 'wx2e75c45bb481e522';
    var secret = 'b1a06c38d2fe0707625e65040ffc1383';
    var mch_id = '1573585771';
    // var key = 'dadiJHJKJKGJHNMBJGYYIO878GHJMG78';
    wx.login({
      //获取code
      success: function (res) {
        console.log(res.code);
        var code = res.code;
        wx.request({
          url: 'https://api.weixin.qq.com/sns/jscode2session?appid=' + appid + '&secret=' + secret + '&js_code=' + code + '&grant_type=authorization_code',
          data: {},
          header: {//请求头
              "Content-Type": "application/x-www-form-urlencoded"
          },
          method: "GET",//get为默认方法/POST
          success: function (response) {
           var openid = response.data.openid;
            console.log(response)
            wx.request({
              url: 'https://fh.linkeddream.com/Api/Wxpayfee/payfee',//改成你自己的链接
              header: {
                'Content-Type': 'application/x-www-form-urlencoded'
              },
              method: 'POST',
              data: {
                "openid": openid,  //用户的openid
                "fee": fee,     //此订单的金额
                "order_number": order_number,   //订单号，本地订单号
                "appid": appid,
                "mch_id": mch_id
              },
              success: function (res) {
                console.log(res.data);
                console.log('调起支付');
                wx.requestPayment({
                  'timeStamp': res.data.timeStamp,
                  'nonceStr': res.data.nonceStr,
                  'package': res.data.package,
                  'signType': 'MD5',
                  'paySign': res.data.paySign,
                  'success': function (res) {
                    console.log('success');
                    // wx.showToast({
                    //   title:'支付成功',
                    //   icon:'success',
                    //   duration:3000
                  },
                  'fail': function (res) {
                    console.log('fail');
                  },
                  'complete': function (res) {
                    console.log('complete');
                  }
                })
              }
            })
          }
        })
      }
    })
  },

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原文链接：https://blog.csdn.net/mafeilong618/article/details/105774864